An invoice calculator adds up your line items, applies an optional discount and tax rate, and shows the subtotal, tax, total, and balance due after any deposit. Enter your line items below to calculate an invoice total, then review the result before creating the matching invoice.
line amount = quantity × rate subtotal = sum of line amounts tax = tax rate × subtotal discount amount = subtotal × discount rate (percentage) or the fixed amount you enter total = subtotal − discount + tax
This matches the InvoiceCraftly editor's own arithmetic: tax is calculated on the subtotal, and a whole-invoice discount is subtracted separately — the discount does not reduce the taxable amount. Balance due, if you enter a deposit or payment already received, is total − deposit.
Worked example
37 hours at €85, 10% discount, 25% VAT
Subtotal: 37 × €85.00 = €3,145.00. Tax at 25% is calculated on that €3,145.00 subtotal: €786.25. A 10% discount is €314.50. The invoice total is €3,145.00 − €314.50 + €786.25 = €3,616.75. A 30% deposit of €1,085.03 leaves a balance due of €2,531.72.
What this means on an invoice
Line items, currency, and discount can carry into the editor
Each line item becomes an invoice line with the same description, quantity, unit, rate, and tax rate. A whole-invoice discount carries the same way, matching the InvoiceCraftly editor's discount field. Deposit and balance due are shown here for planning only — InvoiceCraftly records an actual payment received against the invoice you create, not from this calculator.
Common mistakes
Check these before sending
A whole-invoice discount does not reduce the tax already calculated on the subtotal, here or in the InvoiceCraftly editor — check whether your agreement or local rules expect tax on the discounted amount instead.
A calculated deposit is not the same as a recorded payment — record the actual amount received on the invoice itself.
Enter the tax rate that actually applies; this tool does not determine VAT or sales-tax treatment for you.
Check decimal quantities (for example, 7.5 hours) use the separator your browser expects.
Invoice calculator FAQ
How do I calculate an invoice total?
Add up each line item's quantity × rate for the subtotal, calculate tax on that subtotal, subtract any whole-invoice discount, and the result is the invoice total: subtotal − discount + tax.
What is 37 hours at €85 per hour?
37 × €85.00 = €3,145.00 before any discount or tax.
What is €4,000 plus 25% VAT?
25% of €4,000 is €1,000, so the total is €5,000.
What is the balance after a 30% deposit?
Balance due is the invoice total minus the deposit amount. A 30% deposit on a €3,616.75 total is €1,085.03, leaving €2,531.72.
How does a discount affect an invoice total?
A whole-invoice discount reduces the total directly, but it does not reduce the tax already calculated on the subtotal — tax is calculated on the subtotal first, and the discount is subtracted afterward.
What is the difference between invoice total and balance due?
Invoice total is subtotal minus discount plus tax. Balance due is the invoice total minus any deposit or payment already received.
Can I turn an invoice calculation into an invoice?
Yes. After you calculate a result, choose "Create this exact invoice" to review the line items, currency, and discount in the InvoiceCraftly editor before anything is added.
Does this create an invoice automatically?
No. The button opens a review step in the editor. Nothing changes until you confirm it there.
